Celtic famously dumped the Spanish giants out of the 2003/04 UEFA Cup when, in the fourth round, the Scottish side won 1-0 at home before holding Barca to a goalless draw at the Nou Camp.
"Celtic will be an opponent who will not allow us to rest much, because we must not forget they knocked us out a few years ago in the UEFA Cup," said Begiristain.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms